Jan, I can understand your feelings of wanting to help. But, keep in mind this is more about her feelings than yours. Just because you're friends, doesn't necessarily mean that she's ready to discuss her sexuality with you. Everyone is different when it comes to their comfort level about opening up on personal matters, and there's hardly anything more personal than one's sexual identity.
If rumors are floating around, I'm sure she's probably aware of them. If she chooses to ignore them for now, then let her. Don't push it. Everyone comes out differently, some people do it in one fell swoop, others incrementally, and some never do it at all. But in any case, it is her decision and her time-line. If she feels like she's being forced to admit to something that she's not ready to admit to, she could easily push you away to avoid the subject. Your need to feel helpful, might actually do harm to your friendship and get in the way of her coming out process.
"Just a Guy. Your feelings are touching. I am gladdened by the thought that you will one day wind up 6 feet under as we all do." - MrRoxy ------
"I do not suggest you walk out the door onto a New York street with your vulnerable child part exposed and not protected..." - Jason Bennett